Marine ranch breeding netting antifouling method

Abstract

The invention belongs to the technical field of mariculture, and particularly relates to a marine ranch breeding netting antifouling method. According to the method, polyurethane connecting paint special for netting is used as a bridge, and the netting is coated with flexible antifouling paint so as to prevent the flexible antifouling paint from being washed by seawater and peeled off. The experimental result of hanging a net on the sea for 150 days shows that the netting antifouling paint provided by the invention has good adhesive force on the netting and does not peel off due to scouring of seawater and silt, and the netting antifouling method provided by the invention can effectively prevent barnacles and mussels from adhering and does not influence the growth of cultured aquatic products. The antifouling method for the marine ranch breeding netting has the advantages of being environmentally friendly, easy to operate, low in cost, capable of achieving repeated coating and the like.

Description

Technical Field

[0001] The present invention belongs to the technical field of seawater aquaculture, and specifically relates to a method for preventing fouling of aquaculture netting in a marine ranch. Background Art

[0002] With the increasing demand of the people for high-quality and high-protein foods, the industrial scale of marine ranches will grow day by day.

[0003] At present, aquaculture equipment in marine ranches faces serious biofouling problems. For example, a 1000-kilogram netting can quickly increase to 10000 kilograms within a month due to the attachment of fouling organisms. This will accelerate the aging of the netting, cause the netting to break, and lead to the escape of cultured aquatic products; it will also hinder water exchange and breed diseases. Currently, common solutions to biofouling of aquaculture netting include: biological cycle avoidance method, box rotation anti-fouling method, anti-fouling coating method, mechanical cleaning method, manual cleaning method, etc. These methods all have their respective defects. Among them, the method widely used in the industry is: manual net replacement and cleaning. This method is relatively simple, has low technical requirements, and is the most widely used. However, manual net replacement requires a large amount of manpower and material resources. During the peak season of the growth of fouling organisms, aquaculture enterprises basically replace the netting once a month, and the cost of each net replacement is between 7000 - 10000 yuan per sheet.

[0004] Anti-fouling coatings have the advantages of wide application range and low cost, and are the most economical and commonly used method for preventing marine biofouling, and have been widely used in the ship field. However, there are great differences between aquaculture netting in marine ranches and ships: (1) Netting anti-fouling is static anti-fouling, without an external driving force to drive the detachment of fouling organisms, so relatively high static performance requirements are imposed on the coating itself; (2) Most netting is made of PE or nylon materials, with a relatively low surface energy, and it is difficult for ordinary anti-fouling coatings to adhere. (3) The netting has a large flexibility and is prone to deformation, and ordinary anti-fouling coatings applied to the netting are prone to cracking and peeling with the deformation of the netting. In addition, for anti-fouling coatings applied to aquaculture utensils, it is not only required to have an anti-fouling effect, but also not to affect the growth of cultured organisms, not to accumulate harmful environmental substances, and ensure the safety of cultured foods.

[0005] Currently, most of the anti-fouling coatings on the market are ship anti-fouling coatings, and there is a lack of a green and efficient anti-fouling coating system dedicated to aquaculture netting in marine ranches. Summary of the Invention

[0006] In view of the above technical problems, the present invention provides a method for preventing fouling of aquaculture netting in a marine ranch. First, a special polyurethane connecting paint for netting is coated on the netting, and then a flexible green and environment-friendly netting anti-fouling coating is coated, finally achieving static and efficient anti-fouling of aquaculture netting in a marine ranch.

[0007] The present invention is achieved through the following technical solutions:

[0008] A method for preventing fouling of a culture net in a marine ranch. The method uses a special polyurethane connecting paint for the net as a bridge to coat a flexible antifouling paint on the net to prevent the flexible antifouling paint from being washed off by seawater.

[0009] Further, the method specifically includes the following steps:

[0010] Step S1: Use a high-pressure water gun to wash the floating dust on the surface of the net clean and let it dry naturally;

[0011] Step S2: Uniformly coat the surface of the dried net in Step S1 with the special polyurethane connecting paint for the net and let it dry naturally; among them, the special polyurethane connecting paint for the net plays a bridging role and increases the adhesion between the antifouling paint and the net.

[0012] Step S3: Coat the surface of the net completely dried in Step S2 with the flexible antifouling paint and let it dry completely to obtain an antifouling net for marine ranch culture.

[0013] Further, in Step S2, the coating method of the special polyurethane connecting paint for the net is any one of dip coating, roll coating, brush coating and spray coating, and the thickness of the film formed by the special polyurethane connecting paint for the net after coating is 20 - 40 μm. Among them, the special polyurethane connecting paint for the net plays a bridging role and increases the adhesion between the antifouling paint and the net.

[0014] Further, in Step S3, the coating method of the flexible antifouling paint is any one of dip coating, roll coating, brush coating and spray coating, and the thickness of the film formed by the flexible antifouling paint after coating is 50 - 200 μm.

[0015] Further, the composition and mass content of the special polyurethane connecting paint for the net are: 40% - 45% aqueous polyurethane dispersion XP2593 / 1, 5% - 10% polyurethane elastomer, 5% - 10% nano zinc oxide, 1% - 2% silane coupling agent KH-570, 0.5% - 1% wetting and dispersing agent, 0.1% - 0.5% defoaming agent, 0.2% - 0.5% leveling agent, 31% - 40% solvent; the sum of the mass percentages of each component is equal to 100%.

[0016] Further, the composition and mass content of the flexible antifouling paint are: 30% - 40% organosilicon polyurethane resin, 10% - 20% epoxy polysiloxane resin Silikopon EF, 5% - 10% chlorinated ether resin, 10% - 15% compound antifouling agent, 1% - 2% silane coupling agent KH-570, 0.5% - 1% fumed silica, 0.2% - 0.5% defoaming agent, 0.2% - 0.5% leveling agent and 20% - 30% solvent.

[0017] Further, by mass parts, the compound antifouling agent comprises 5-10 parts of cuprous oxide, 2-5 parts of zinc pyrithione, and 3-5 parts of Zanthoxylum nitidum extract.

[0018] Advantageous technical effects of the present invention:

[0019] In the flexible antifouling coating adopted in the present invention, a compound antifouling agent is added. In the compound antifouling agent, zinc pyrithione and Zanthoxylum nitidum extract are selected to be compounded with cuprous oxide, reducing the dosage of cuprous oxide and enhancing the antifouling efficiency and environmental protection performance of the antifouling agent. Cuprous oxide mainly prevents fouling through the toxic effect of copper ions, zinc pyrithione prevents fouling through the synergistic effect of zinc ions and organic sulfur compounds, while Zanthoxylum nitidum extract prevents fouling through alkaloids, anti-inflammatory and antioxidant effects. The different action mechanisms of these three antifouling agents can complement each other to improve the antifouling effect. In addition, through the combined action of copper ions, zinc ions and alkaloids in Zanthoxylum nitidum extract, a multiple toxic environment is formed, which has a stronger inhibitory effect on the attachment and growth of marine organisms.

[0020] The netting has strong flexibility and is prone to deformation in the marine environment. If the flexibility of the coating is insufficient, cracking and peeling will occur when the netting deforms; the special polyurethane connecting paint for netting adopted in the present invention has good flexibility, ensuring that it will not crack or peel when the netting deforms.

[0021] The flexible antifouling coating adopted in the present invention combines the low surface energy antifouling mechanism of silicone resin with the chemical antifouling mechanism of the antifouling agent, improving the static antifouling characteristics of the coating to ensure that it can meet the static antifouling requirements of the marine ranch.

[0022] The netting antifouling method provided by the present invention can design the film thickness according to the growth cycle of the aquaculture products to control the antifouling period, and can be repeatedly coated after the antifouling period has expired, thereby endowing it with a new antifouling effect.

[0023] The netting antifouling method provided by the present invention has the advantages of low price, simple operation method, time-saving and labor-saving, etc. Detailed embodiments

[0024] In order to make the objectives, technical solutions and advantages of the present invention clearer, the following further describes the present invention in detail with reference to embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0025] On the contrary, the present invention covers any alternatives, modifications, equivalent methods and solutions made within the essence and scope of the present invention defined by the claims. Further, in order to enable the public to have a better understanding of the present invention, some specific details are described in detail in the following detailed description of the present invention. Those skilled in the art can fully understand the present invention without the description of these details.

[0026] The present invention provides an embodiment of a method for preventing fouling of a culture net in a marine ranch. The method uses a special polyurethane connecting paint for the net as a bridge to coat a flexible antifouling paint on the net to prevent the flexible antifouling paint from being washed off by seawater.

[0027] In this embodiment, the method specifically includes the following steps:

[0028] Step S1: Use a high-pressure water gun to wash the dust on the surface of the net clean and dry it naturally.

[0029] Step S2: Uniformly coat the surface of the dried net in Step S1 with the special polyurethane connecting paint for the net and dry it naturally.

[0030] Step S3: Coat the surface of the net completely dried in Step S2 with the flexible antifouling paint and dry it completely to obtain an antifouling net for marine ranch culture.

[0031] In Step S2, the coating method of the special polyurethane connecting paint for the net is any one of dip coating, roll coating, brush coating, and spray coating. The thickness of the film formed by the special polyurethane connecting paint for the net after coating is 20 - 40 μm.

[0032] In Step S3, the coating method of the flexible antifouling paint is any one of dip coating, roll coating, brush coating, and spray coating. The thickness of the film formed by the flexible antifouling paint after coating is 50 - 200 μm. Specifically, the present invention can adjust the thickness of the film by changing the coating times and control the antifouling performance through the thickness of the film.

[0033] In this embodiment, the composition and mass content of the special polyurethane connecting paint for the net are as follows: 40% - 45% aqueous polyurethane dispersion XP2593 / 1, 5% - 10% polyurethane elastomer, 5% - 10% nano zinc oxide, 1% - 2% silane coupling agent KH-570, 0.5% - 1% wetting and dispersing agent, 0.1% - 0.5% defoaming agent, 0.2% - 0.5% leveling agent, 31% - 40% deionized water; the sum of the mass percentages of each component is equal to 100%.

[0034] The special connecting paint for the net provided in the present invention is a polyurethane connecting paint. Among its main components, the aqueous polyurethane dispersion XP2593 / 1 is produced by Bayer MaterialScience LLC. The paint prepared with XP2593 / 1 resin has excellent adhesion, has a similar structure to the nylon substrate, and can improve the adhesion between the paint and the substrate. XP2593 / 1 provides physical adhesion, while KH-570 further enhances this adhesion through chemical bonding; this dual effect makes the combination between the coating and the substrate more firm. The polyurethane elastomer can increase the flexibility of the coating; the nano zinc oxide can increase the smoothness and wear resistance of the coating.

[0035] In this embodiment, the preparation method of the special connecting paint for fishing net includes:

[0036] Step S1: Mix the aqueous polyurethane dispersion XP2593 / 1, the silane coupling agent KH-570 and the polyurethane elastomer, and disperse them evenly by a disperser.

[0037] Step S2: Slowly add nano-zinc oxide, and continue to stir and disperse evenly.

[0038] Step S3: Add a wetting dispersant, an antifoaming agent and a leveling agent respectively, disperse evenly, and grind with a colloid mill until the fineness is less than 60 μm.

[0039] Step S4: Add a solvent to adjust the viscosity to 100-400 mPa·s, pass through a 200-mesh screen, and discharge the material.

[0040] In this embodiment, the composition and mass content of the flexible antifouling paint are as follows: 30%-40% organosilicon polyurethane resin, 10%-20% epoxy polysiloxane resin Silikopon EF, 5%-10% chlorinated polyether resin, 10%-15% compound antifouling agent, 1%-2% silane coupling agent KH-570, 0.5%-1% fumed silica, 0.2%-0.5% antifoaming agent, 0.2%-0.5% leveling agent and 20%-30% solvent. Among them, the epoxy polysiloxane resin Silikopon EF is an organosilicon epoxy hybrid resin produced by Evonik Corporation.

[0041] In this embodiment, by mass, the compound antifouling agent includes 5-10 parts of cuprous oxide, 2-5 parts of zinc pyrithione and 3-5 parts of extract of Zanthoxylum nitidum.

[0042] In the compound antifouling agent, the antifouling performance of the antifouling agent is improved by adding zinc pyrithione and the extract of Zanthoxylum nitidum to compound with cuprous oxide, the dosage of cuprous oxide is reduced, and the environmental protection performance of the paint is improved.

[0043] In this embodiment, the preparation method of the flexible antifouling paint includes:

[0044] Step S1: Disperse the organosilicon polyurethane resin, the epoxy polysiloxane resin Silikopon EF and the chlorinated polyether resin evenly by a disperser.

[0045] Step S2: Slowly add the compound antifouling agent and disperse evenly.

[0046] Step S3: Add the silane coupling agent KH-570 and fumed silica, and disperse evenly by a film-forming process.

[0047] Step S4: Add defoamer and leveling agent. After dispersing evenly, adjust the viscosity to 100 - 400 mPa / s with a solvent, pass through a 200 - mesh screen, and discharge the material.

[0048] The flexible antifouling coating provided by the present invention is composed of a flexible silicone antifouling resin, an environment - friendly composite antifouling agent, additives, and a solvent. The prepared antifouling coating has good flexibility and will not crack or fall off with the deformation of the netting. By synergistically combining the low - surface - energy antifouling mechanism provided by the silicone polyurethane resin and the antifouling mechanism of the compound antifouling agent, the antifouling effect of the antifouling coating is improved, and the environmental protection performance of the coating is enhanced.

[0049] The following are specific application examples:

[0050] Example 1: A method for preventing fouling of a mariculture netting, the method comprising:

[0051] Coating of the connecting paint: Cut the netting into small pieces of 1 m × 1 m, clean and dry them, then soak them in the special polyurethane connecting paint for netting. Take them out after 10 min and air - dry naturally.

[0052] Coating of the antifouling paint: Place the netting coated with the special polyurethane connecting paint for netting on an epoxy board, and then apply the flexible antifouling paint on the netting by roller coating, and air - dry naturally.

[0053] Open - sea net - hanging experiment: Fix the coated netting on a 1 m × 1 m frame, and tie sandbags to the netting to prevent the netting from floating. Then, hang the netting with sandbags on the fishing raft in the aquaculture base, and regularly observe the growth of fouling organisms on the netting.

[0054] Example 2: Conduct an open - sea net - hanging experiment using a blank netting:

[0055] Fix a 1 m × 1 m blank netting (the blank netting is not coated with the special polyurethane connecting paint for netting and the flexible antifouling paint) on a 1 m × 1 m frame, and tie sandbags to the netting to prevent the netting from floating. Then, hang the netting with sandbags on the fishing raft in the aquaculture base, and regularly observe the growth of fouling organisms on the netting.

[0056] Example 3: According to the method of Example 1, coat the special polyurethane connecting paint for netting on the netting, but do not coat the antifouling paint. After air - drying, conduct an open - sea net - hanging experiment (the open - sea net - hanging experiment conditions are the same as those in Example 1), and regularly observe the growth of fouling organisms on the netting.

[0057] Example 4: According to the method of Example 1, without coating the special polyurethane connecting paint for netting, directly roll - coat the antifouling paint on the netting. After air - drying, conduct an open - sea net - hanging experiment (the open - sea net - hanging experiment conditions are the same as those in Example 1), and regularly observe the growth of fouling organisms on the netting.

[0058] Example 5: The operation of Example 5 is the same as that of Example 1. The only difference is that the antifouling coating used is a non-flexible cuprous oxide self-polishing antifouling coating.

[0059] Example 6: The operation of Example 6 is the same as that of Example 1. The only difference is that the fishing net selected is an old fishing net that has been used and not coated with any antifouling coating.

[0060] Example 7: The operation of Example 7 is the same as that of Example 1. The only difference is that the fishing net selected is a fishing net that has been coated with an antifouling coating and has become ineffective.

[0061] Example 8: The operation of Example 8 is the same as that of Example 1. The only difference is that the connection paint is applied by roller coating.

[0062] Example 9: The operation of Example 9 is the same as that of Example 1. The only difference is that the connection paint is applied by spraying.

[0063] Example 10: The operation of Example 10 is the same as that of Example 1. The only difference is that the antifouling coating is applied by dipping.

[0064] Example 11: The operation of Example 11 is the same as that of Example 1. The only difference is that the antifouling coating is applied by spraying.

[0065] Example 12: Take a culture cage. By means of roller coating, first apply the special polyurethane connection paint for fishing net on the fishing net on its outer surface, and then apply the flexible antifouling coating after natural drying. The tray for placing shellfish seedlings in the middle is not coated. After complete drying, place the shellfish seedlings in the tray of the cage and place it in the culture area. After culturing for a certain period of time, observe the growth of fouling organisms on the outer fishing net of the cage and the growth of shellfish, and make a comparison with the blank (the blank group uses a fishing net without any antifouling treatment).

[0066] By weighing the mass increase of the fishing net after hanging in the sea for 150 days, calculate the fouling organism attachment rate, and quantitatively evaluate the antifouling performance of the culture method provided by the present invention. The specific calculation formula for the fouling organism attachment rate is as follows:

[0067] Fouling organism attachment rate = (m1 - m0) / s;

[0068] m1 is the mass of the fishing net after hanging in the real sea for 150 days; m0 is the mass of the fishing net after water absorption saturation after hanging for 1 day.

[0069] In Examples 1 to 11 of the project, after hanging the net in the real sea for 150 days, the fouling organism attachment rate of the fishing net and the attachment situation of the paint on the fishing net itself are shown in Table 1.

[0070] Table 1 Fouling organism attachment rate of fishing net in Examples 1-11 and coating adhesion on the net

[0071]

[0072]

[0073] According to Table 1, Example 2 is a blank fishing net without anti-fouling coating. The fouling organisms on the net grew rapidly, reaching 10.37 kg / m 2 , which is 20 times the weight of the net (after water absorption saturation). Examples 1, 8-11 are the anti-fouling situations after applying anti-fouling coatings by different coating methods. After 150 days of hanging the net, the growth of fouling organisms is between 1.02 and 2.09 kg / m 2 , which is 2 to 4 times the weight of the net itself. The growth amount of fouling organisms decreased by more than 80% compared with that without applying anti-fouling coating. Thus, it can be seen that although the coating methods are different, they all have significant anti-fouling effects.

[0074] For the special polyurethane connecting paint for fishing net, due to its low solid content, the mass of the fishing net itself changes little after solvent evaporation by dip coating and roll coating. Among them, dip coating has simple operation, saving time and effort; relatively speaking, roll coating operation is more complex. Due to the large number of meshes on the fishing net, the paint waste is relatively serious during spraying, and the spraying is uneven at the knots of the fishing net. Therefore, preferably, the coating method of the special polyurethane connecting paint for fishing net is dip coating. For the anti-fouling coating, its solid content is high. When dip coating, the consumption of anti-fouling coating is large. After coating, the weight of the fishing net increases by 2 times, and the dry film thickness reaches more than 300 μm, resulting in serious paint waste. During spraying, paint waste also occurs, and the spraying is uneven at the knots. Therefore, preferably, the coating method of the anti-fouling coating is roll coating.

[0075] The influence of coating the connecting paint on the performance of the anti-fouling coating was compared (Examples 1, 3, 4). The results show that when the connecting paint is not coated, the anti-fouling coating on the fishing net is easily washed off by seawater, and the single connecting paint does not play any anti-fouling role, and even more fouling organisms grow. The possible reason is that the coating of the special polyurethane connecting paint for fishing net increases the surface roughness of the fishing net, providing more abundant sites for the attachment of fouling organisms. After coating the connecting paint, after 150 days of experimental net hanging, the anti-fouling coating did not show any falling-off phenomenon. Thus, it can be seen that the connecting paint can play a "bridge" role, connecting the anti-fouling coating and the fishing net. At the same time, the old fishing net that has been used but not coated with any anti-fouling coating was cleaned and then coated with anti-fouling coating (Example 6), and a 150-day sea hanging net experiment was carried out. The results show that the growth rate of fouling organisms on the fishing net after coating the anti-fouling coating is 1.53 kg / m 2, compared with the blank netting, the fouling organism growth rate decreased by more than 85%. This shows that the netting anti-fouling method provided by the present invention is applicable to the coating of existing old netting in marine pastures. In addition, the anti-fouling coating was also applied to the netting that had already been coated with the anti-fouling coating (Example 7). After 150 days of sea trial with the netting hanging in the sea, the anti-fouling coating did not show peeling or cracking, and the fouling organism growth rate was 1.28 kg / m 2 , compared with the blank netting, the fouling organism growth rate decreased by 88%, indicating that the provided netting anti-fouling method can be applied for secondary coating on the netting without affecting its anti-fouling performance. Since most of the current anti-fouling coatings on the market are cuprous oxide self-polishing coatings, such coatings were applied to the netting (Example 5) and sea trial with the netting hanging in the sea was carried out. However, due to the lack of rigidity of the netting and its easy deformation, such anti-fouling coatings are prone to cracking and peeling after being applied to the netting, and the anti-fouling effect is not ideal.

[0076] Example 12 was to apply the anti-fouling coating to the aquaculture cage according to the method of Example 1, mainly aiming to investigate the influence of the anti-fouling coating on cultured shellfish. The influence of the netting anti-fouling method provided by the present invention on the growth of cultured shellfish was investigated by calculating the weight change (growth rate) of the cultured shellfish after 150 days. After 150 days of sea trial, the growth rate of the cultured shellfish after applying the anti-fouling coating was 209%, while for the netting without any anti-fouling treatment, the growth rate after 150 days was 221%. At the same time, according to GB 2762-2022, the pollutant residues in the cultured aquatic products were detected, and the test results did not show any excessive pollutants, indicating that the provided netting anti-fouling method has basically no impact on the growth and safety of cultured shellfish, and the method is green and environmentally friendly. The results of the 150-day sea trial with the netting hanging in the sea show that the flexible anti-fouling coating provided by the present invention has good adhesion on the netting and has not peeled off due to the scouring of seawater and sediment. The provided netting anti-fouling method can effectively prevent the attachment of barnacles and mussels without affecting the growth of cultured aquatic products.

[0077] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. A method for preventing fouling of a cultivation net in a marine ranch, characterized in that, The method uses a special polyurethane connecting paint for fishing nets as a bridge to coat the flexible antifouling paint onto the fishing nets, preventing the flexible antifouling paint from peeling off due to being washed by seawater.

2. The anti-fouling method for the aquaculture net of the offshore ranch according to claim 1, wherein The method specifically includes the following steps: Step S1: Use a high-pressure water gun to wash the dust on the surface of the fishing net clean and let it dry naturally. Step S2: Uniformly coat the surface of the dried fishing net in Step S1 with the special polyurethane connecting paint for fishing nets and let it dry naturally. Step S3: Coat the surface of the fishing net that has completely dried in Step S2 with the flexible antifouling paint again and let it dry completely to obtain an antifouling fishing net for mariculture.

3. The method for preventing fouling of a mariculture net according to claim 2, wherein, In Step S2, the coating method of the special polyurethane connecting paint for fishing nets is any one of dip coating, roll coating, brush coating, and spray coating. The thickness of the film formed by the special polyurethane connecting paint for fishing nets after coating is 20 - 40 μm.

4. The anti-fouling method for a mariculture net according to claim 2, characterized in that, In Step S3, the coating method of the flexible antifouling paint is any one of dip coating, roll coating, brush coating, and spray coating. The thickness of the film formed by the flexible antifouling paint after coating is 50 - 200 μm.

5. The anti-fouling method for a mariculture net of a marine ranch according to claim 1, characterized in that, The composition and mass content of the special polyurethane connecting paint for fishing nets are as follows: 40% - 45% aqueous polyurethane dispersion XP2593 / 1, 5% - 10% polyurethane elastomer, 5% - 10% nano zinc oxide, 1% - 2% silane coupling agent KH-570, 0.5% - 1% wetting and dispersing agent, 0.1% - 0.5% defoaming agent, 0.2% - 0.5% leveling agent, 31% - 40% deionized water; the sum of the mass percentages of each component is equal to 100%.

6. The anti-fouling method for a mariculture netting according to claim 1, characterized in that The composition and mass content of the flexible antifouling paint are as follows: 30% - 40% organosilicon polyurethane resin, 10% - 20% epoxy polysiloxane resin Silikopon EF, 5% - 10% chlorinated polyether resin, 10% - 15% compound antifouling agent, 1% - 2% silane coupling agent KH-570, 0.5% - 1% fumed silica, 0.2% - 0.5% defoaming agent, 0.2% - 0.5% leveling agent, and 20% - 30% solvent.

7. The flexible anti-fouling coating according to claim 5 and claim 6, characterized in that The defoamer is a silicone defoamer SI 2040 and any one of SI 2722, polyether-modified silicone defoamers Tego Foamex 843 and Tego Airex 902W; the leveling agent is any one of polyether-modified silicone leveling agents Byk-333, Byk358, and Byk361; the solvent is one of butyl acetate, cyclohexanone, and deionized water.

8. The method for preventing fouling of a cultivation net in a marine ranch according to claim 6, wherein, Calculated by mass parts, the compound antifouling agent includes 5 - 10 parts of cuprous oxide, 2 - 5 parts of zinc pyrithione, and 3 - 5 parts of Zanthoxylum nitidum extract.

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